Relations between the amplitudes of acoustic waves excited by a thin elastic plate under the effect of external forces and the amplitudes of waves scattered by this plate are obtained. Two cases are considered: when the plate separates acoustic media filling two half-spaces and when it separates acoustic media filling an acoustic waveguide. The energy conservation law is used to derive the identities that determine the relations between the amplitudes of acoustic waves radiated by a thin elastic plate under the action of forces.
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